Hey Carlito...i used to feel dizzy when i started doing shaun t's insanity..what caused it was lack of feul(i wasnt eating enough 4 insanity)..but then i slightly made some changes in my diet..& poof im energitic enough.. however, thats not always the cause..sometimes its overexertion or a medical case..check this web sit:

I also used to we like this and where I couldn't breathe take deep breathes and more breaks one minute per workout don't over work yourself. Improvement takes time. Trust me it took me a while but it's worth it. Oh and drink a ton of water! Good luck

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Iron is what helps our muscles store and use oxygen. It's in our blood. Carries oxygen from our lungs throughout our bodies. If your iron is low you can't donate blood. And it can cause fatigue, dizzyness, and weakness.